I flew 76 different types of airplanes and the only one with an AOA gauge was the citation jet. It was fun to look at but didn't really do anything. Sure, put an AOA gauge in every airplane and see how safety improves. It works well for carrier landings otherwise just fly the F....n airplane, you don't need it. Honor stall warnings and if you ever get one in your career ask yourself how it happened. Then never do it again.